What is the Quantity of Water that Must be Added to Make the Ratio 7:6? If

The ratio of milk and water in a 55 kg mixture is 7:4. What is the quantity of water that must be added to make the ratio 7:6?

  1. 15 kg
  2. 10 kg
  3. 5 kg
  4. 12 kg
Monis Rasool Professor Asked on 10th June 2015 in Maths.
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1 Answer(s)

Answer: (2) 10 kg.
Explanation:-
Let be the quantity of milk in a mixture = 7X and quantity of water in a mixture = 4X
Mixture = 55 kg.    (Given)
7X + 4X = 55
11X = 55
X = 5
Then, quantity of milk in a mixture = 7 x 5 = 35 km and water = 5 x 4 = 20 kg.

Let be the Y litres of water must be added to make the ratio = 7:6
Then, 35/ (20 + X) = 7/6
210 = 140 + 7X
7X = 70
X = 10

Hence, the answer is (2) 10 kg.

Anurag Mishra Professor Answered on 11th June 2015.
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